A Practical and Stereocontrolled Synthesis of a Versatile 1.BETA.-Methylcarbapenem Intermediate.
作者:Kozo ODA、Akira YOSHIDA
DOI:10.1248/cpb.45.1439
日期:——
S-[2-(Dialkylaminocarbonyl)phenyl](2R)-2-[(3S, 4S)-3-[(1R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-oxo-4-azetidinyl]thiopropionate (11), useful intermediates for the synthesis of 1β-methylcarbapenems including 1β-methylthienamycin, were prepared in a highly stereoselective manner by the reaction of E-1-(tert-butyldimethylsilyloxy)-1-[2-(dialkylaminocarbonyl)phenylthio]-1-propene (10) with commerically available (3S, 4R)-3-[(1R)-1-(tert-butyldimethylsilyloxy)ethyl]-4-acetoxyazetidin-2-one (6) in the presence of zinc chloride catalyst. The diethylaminocarbonyl derivative (11b) was particularly convenient for practical production because of its highly crystalline nature.
S-[2-(二烷基氨基羰基)苯基](2R)-2-[(3S, 4S)-3-[(1R)-1-(叔丁基二甲基硅氧基)乙基]-2-氧代-4-氮杂环丁基]硫代丙酸酯 (11),是合成 1β-甲基碳青霉烯类包括 1β-甲基噻那霉素的有用中间体、E-1-(tert-butyldimethylsilyloxy)-1-[2-(dialkylaminocarbonyl)phenylthio]-1-propene (10) 与市售的 (3S,4R)-3-[(1R)-1-(tert-butyldimethylsilyloxy)乙基]-4-乙酰氧基氮杂环丁烷-2-酮 (6) 在氯化锌催化剂存在下反应,以高度立体选择性的方式制备了 1β-甲基碳青霉烯类化合物。由于二乙基氨基羰基衍生物(11b)具有高结晶性,因此特别便于实际生产。